Many years ago I did quite a bit of experimenting below 10kHz. This was reception of G6ALB at 3km on 8.97kHz. I think he was running about 40W. This was 2011.
See https://sites.google.com/site/sub9khz/vlf-using-earth-mode.
Simple QRP projects, 10m, 8m, 6m, 4m, FT8, 160m, WSPR, LF/MF, sub-9kHz, nanowaves and other random stuff, some not related to amateur radio.
See https://sites.google.com/site/sub9khz/vlf-using-earth-mode.
Solar flux is 100 and the SSN 23. A=9 and K=3..
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